OpenGL Mathematics (GLM)
Library to encode and decode images in WebP format
ImageMagick 7
darktable is an open source photography workflow application
A layer built on top of the Insight Toolkit (ITK)
A fast image processing library with low memory needs
A modern, cross-platform, 2D Graphics library for .NET
A powerful cross-platform raw photo processing program
Resize images and animated GIFs in Go
ArrayFire, a general purpose GPU library
Swiss army knife of image processing
A collection of packages providing extra functionality for GNU Octave
Scanning probe microscopy data visualisation and analysis
Scan Tailor Experimental is an interactive post-processing tool
Scientific Visualisation Made Easy
Resilient Image Library - successor to DevIL
itom - an Open Source Measurement, Automation and Evaluation Software
Image processing library in C/C++
A dithering software based around floats
ProStack - a platform for image processing and analysis
Tools for 3D image analysis of additively manufactured parts
Astronomical object/structure detection from 1D and 2D data sets.